**Disclaimer:** This guide assumes that you are already familiar with OMORI mod development, and that you know where some files need to go. You should also already know how to [[modding:resetting-installation|fix your OMORI installation]], in case you break it.\\
Furthermore, some mods might not work in SDK mode.((For example, //[[https://mods.one/mod/painrush|Painful bossrush]]// will check for SDK mode and stop working if detected.))

To get [[https://flaviocopes.com/browser-dev-tools|dev tools]] in OMORI, which can be very helpful in debugging your mod, you need to do a few steps:

  - Download the SDK edition of the exact same NW.js version that OMORI is using (for OMORI v1.0.8, that's [[https://dl.nwjs.io/v0.29.0|nwjs-sdk-v0.29.0-win-x64.zip]]).
  - Drag all your files into the OMORI folder and choose replace / overwrite
  - Add this code to //www/js/main.js// to disable SDK mode protection:<code javascript>
window.navigator.plugins.namedItem = function() {
    return null;
}
</code>
  - Rename OMORI.exe to something else, like OMORI_old.exe, and rename the new file nw.exe to OMORI.exe
  - Launch the game and press //F12// to open the dev tools.